RE: nRF9160 PSM and eDRX Modes

Martin Lesund — Mon, 29 Jun 2020 13:40:23 GMT

Hi WesC,

The response from AT+CPSMS? is only what the application has requested and not what you have actually been granted from the network.

To get the real value from what you have gotten from the network, you can use AT+CEREG?.

(see Active-Time and Periodic-TAU)

Please see the different options for power optimization in asset_tracker here: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/applications/asset_tracker/README.html#power-optimization

Please make sure you are using a SIM card that gives you access to PSM/eDRX features.
iBasis SIM is limited, depending on where you are located : https://devzone.nordicsemi.com/nordic/cellular-iot-guides/b/hardware-design/posts/ibasis-esim-national-coverage-update

As for now, we do not have support for reading out via AT command if the modem is in PSM mode or not. (it should come in the future)
This best checked via CEREG that you are granted PSM and then through current measurements, you can see when you are in PSM mode or not.

(we have this command, but it only check if the modem is in Connected or in IDLE/PSM mode, so it does not differentiate between RRC IDLE or PSM mode)

BR,
Martin l.